Honing apparatus



July 29,1958 G. M. cALvERTA f HoNING APPARATUS `3 SheetsN-Sheet 1 Filed Aug. 15, -1956 July 29, 1958 G. M. cALvERT 2,844,920

HONING APPARATUS Filed Aug. 1s, 1956 s sheets-sheet 2 "H-rw n JEM v u INVENToR. 6 'eW Can/erf @-5. lgwg- @y G. MQcALvER-r x-xoNING APPARATUS July 29, 1958 3 Sheets-Sheet 5 Filed Aug. 15, 1956 INVENTOR.

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United States Patent HONING APPARATUS Glen M. Calvert, Detroit, Mich.

Application August 13, 1956, Serial No. 603,479

1s Claims. (01.51-34) This invention relates to honing 'apparatus and particularly to improvements and structural features adapted to be embodied in a honing tool for honing the tapered or cone shaped bore of a tubular workpiece.

An important object of the invention is to provide a honing apparatus or tool having rotatable spindle means guided for reciprocable travel in a straight line direction or in directions axially of the spindle means and in addition to provide honing means adapted to reciprocate and rotate with the spindle means, such honing means being so supported and connected to the spindle means as to enable the honing means to travel angularly with respect to the direction of travel of the spindle means so as to hone a tapered or cone shaped bore.

An additional object of the invention is to provide a honing apparatus or tool embodying, in addition to the foregoing features, means for imparting movement to or progressive displacement of the honing means in a direction axially of the spindle means thereby to cause the honing means to continue effective and uniform honing of the tapered bore and the removal of stock therefrom until the bore has been honed to a predetermined size.

In accordance with the embodiment of the invention herein illustrated there is provided reciprocable and rotatable spindle means together with honing means rotatable with the spindle means. The honing means preferably includes a honing head held against reciprocable travel with the spindle means and having annularly spaced abrading elements actuated by the spindle means so as to enter rst the end of the tapered bore having the largest diameter, travel therefrom in one direction to the end of the tapered bore having the smallest diameter, and thereupon travel in the reverse direction through the bore. In accomplishing the foregoing the abrading or honing head is provided with taper guide means conforming to the taper of the workpiece bore and adapted to shiftably support the abrading elements so that the working or abrading surfaces thereof also conform to the shape of the tapered or cone shaped workpiece bore thereby causing the abrading elements to have uniform contact with the bore at all times during reciprocation and rotation thereof by the spindle means.

The honing devices or abrading elements are drivingly connected to the tool spindle means for rotation and reciprocation therewith through the medium of longitudinal push and pull link means pivotally connecting each honing device to the tool spindle means. These link connections enable the angularly related abrading elements or honing devices, shiftably carried by the cone shaped honing head, to travel along the tapered or cone shaped bore of the workpiece while at the same time the honing tool spindle travels in a rectilinear path. In order to control the path of travel of the honing tool there is mounted adjacent the outer end of the tool an annular guide support carrying outwardly and radially projecting guide members formed, for example, of carbide material. These guide members rotatably engage and travel along ICC 2 the inner surface of the rectilinearly disposed cylindrica bore of a giude. In the illustrated embodiment the cylindrical guide for the tool spindle comprises an integral extension of the cone shaped or tapered workpiece which is to be honed by the tool. It will be understood, however, that the cylindrical guide may be separate from the workpiece to be honed, and in such case the guide would be supported so as to terminate proximate to the enlarged tapered or cone shaped end of the workpiece.

For the purpose of enabling the abrading elements or honing stones to maintain eiective honing action on the tapered workpiece bore during the period that removal of stock from the bore continues, there is connected to the honing head one end of a shaft or rod extending axially within the tubular spindle means. The opposite end of this shaft or rod is connected to improved mechanism which may be adjustably operated to move the shaft or rod axially of the spindle means thereby adjustably moving the honing head axially of the Workpiece bore. Such axial adjustment or movement of the shaft or rod in one direction maintains effective honing action by the honing stones or abrading means, whereas axial adjustment or shifting of the shaft or rod together with the honing head in the opposite direction frees the abrading means from the workpiece bore and thereby terminates the honing operation.

In the illustrated embodiment there is provided stationary manually operable mechanism for dimensionally adjusting the honing or abrading head axially of the workpiece bore, such mechanism being adapted to have operative connection with the adjusting shaft or rod which in turn is connected to the honing head. This operative connection is such as to enable it to be released or disconnected from the adjusting shaft whereby the entire honing mechanism may be withdrawn from the workpiece or shifted in a direction entirely away from the operating Zone of the honing tool. It will be understood that power controlled means may be utilized to axially adjust the honing head and that termination of the honing operation may be initiated or controlled by actuation of a limit switch thereby resulting in freeing the abrading means from the workpiece bore.

Other objects of this invention will appear in the following description and appended claims, reference being had to the accompanying drawings forming a part of this specification wherein like reference characters designate corresponding parts in the several views.

Fig. l is a fragmentary View, mainly in longitudinal mid-section, illustrating a honing apparatus constructed in accordance with the present invention.

Fig. 2 is an enlarged front end elevation taken from lines 2-2 of Fig. l looking in the direction of the arrows.

Fig. 3 is an enlarged fragmentary plan view taken from lines 3 3 of Fig. l looking in the direction of the arrows.

Fig. 4 is an enlarged sectional view taken substantially through lines 4-*4 of Fig. l looking in the direction of the arrows.

Fig. 5 is an enlarged fragmentary sectional view taken substantially through lines 5-5 of Fig. l looking in the direction of the arrows.

Fig. 6 is an enlarged fragmentary sectional view taken substantially through lines 6 6 of Fig. 5 looking in the direction of the arrows.

Fig. 7 is a sectional View taken substantially through lines 7-7 of Fig. 6 looking in the direction of the arrows.

Before explaining in detail the present invention it is to be understood that the invention is not limited in its application to the details of construction and arrangement of parts illustrated in the accompanying drawings, since the invention is capable of other embodiments and of being practiced or carried out in variousways.` Also 3 it is to` be underSfOQd that the Phraseqlgey or terminalogy employed herein is for the purpose of description and not of limitation.

Inthe drawings therey is illustrated a honing tooll or apparatus which is. attachable at itsupper or inner endl to the. conventional; machine spindle. The honing tool, depending upon the type of-machine with` which it is4 used, may extend either vertically, or at an angle such as 45 or horizontally. In` the present instance the tool operates in a vertical position, although it is understoodv thatthis is merely for. illustrative purposes.

In accordance with the present embodiment the honing mechanism is provided with a tubular` honing tool spindle or drive shaft 1,0. at theA outerV end of which is supportedta tapered; o1' cone shaped abrading or honing head; 11 forming a. taperguide for the honing devices as hereinafter described. A tool spindle driving sleeve 12 has one end thereof fitting into the end. 10a of the spindle and. attached thereto. by locking pins 12a. Secured to the driving sleeve 12 is an attaching collar 13 providedv with internal threads 13a through the medium of which the collar 13 may be screwed onto the endA of the machine spindle (not shown) which is operated in conventional mannerr to both reciprocate and rotate the honing toolv spindle or drive shaft 1 0.

Embracing the spindle is a non-rotatable cylindrical sleeve 15 having a cylindrical section or portion 15a of enlargeddiameter. Mounted within the sleeve portion 15a are longitudinally spaced ball bearing races 16 and 17. A bearing ring 18 is interposed between the ballbearing races 16 and 17, this bearing ring being free to rotate within the sleeve portion 15a. A transverse driving or adjusting pin 19 has opposite ends press fitted intoholes in the bearing ring 18. This driving or adjusting pin 1 9.passes freely through opposed longitudinal guide Vslots 20 in the spindle 10, this construction enabling the spindle to be reciprocated relatively to the pin 19 and also enabling this pin to be adjusted along the slots 20 longitudinally of the spindle 10. A honing or abrading headfadjusting rod or draw bar 21 is connected at its rear or upper end to the pin 19, this pin extending through a hole in the rod 21 and having 4a press 't therein.

A cylindrical spacer member 22 is interposed between the portion 15a of the sleeve 15 and the spindle 10, this member being spaced from the spindle and terminating at its rear end in an enlarged diameter flange 23. A retainer ring 24` is seated in an annular depression formed at the end face of the flange 23, this retainer ring being attached to the flange 23 and also to the end of the sleeve portion 15a` by attaching screws 25. A bearing ring 26 is mounted between the spacer member 22 and the spindle 10, this bearing ring being held in position by means of the retainer ring 24 and the edge of an annular recess formed in the spacer member 22. A forward bearing ring 27 is disposed between the forward end of the sleeve 15 and the tool spindle 10. This bearing ring is disposed within an annular recess in the sleeve 15 and is held in place by means of a retainer ring 28 freely embracing the spindle 10 and attached to the end of the sleeve 15 by screws 29. It will be noted that the sleeve 15 and spacer member 22, which are attached together, are nonrotatable. However, they are connected to the rotatable spindle 10 for longitudinal adjustment relative thereto by the adjusting or driving pin 19 and bearing ring 18 which rotate with the spindle. Adjustment of pin 19 longitudinally within the guide slots 20 results in adjusting the draw bar 21 longitudinally.

The honing head adjusting` rod or draw bar 21 is adjusted axially and within`- the spindle 10 by means of an adjusting slide 30, Figs. 5 to 7, this slide being disposed in faceto face relation toa bracket member or plater31. The bracket plate ltterminates in a bracket extension member 32, Figs. 5 and 6, these members 31 and 32binswldd t0gethe an@ thabraskst member,

31 being. Welded. to, a fused frame riser 33, see Fia 5- The slide is formed with an upper longitudinal channel or recess 34 within which a locating block 35 is fitted and secured. It will be noted that the lower arcuate edge of the spacer member flange 23, see Fig. 5, terminates somewhat above the upper face of the adjusting slide 30. The locating block 35, see Figs. 6 and 7, is integrally formed with a projecting clamping member or block 35a of reduced width. This clamping member 35a is adapted to fit within a slot 36 in the spacer member flange 23. The locating block is attached to the adjusting slide 30 within the channel 34 through the medium of anchor screws 37. The slide 30 is provided at its rear face with aV vertical channel or groove 38, Figs. 5

f 'and 6, adapted to receive a clamping member 39 which is vertically adjustable within the channel 38. This clamp member is provided with a vertical slot 40 through which freelyextendsaclamping-screw 41 adapted to be screwed into athwded hQ1f42 in the, slide 30, see Fig. 6. The clamping Screwy 41 terminates integrally in an annular head 43 which, through abushing 43a, overlies the slot 40fand'is, engagea,ble` with the clamp member 3.9-at opposite sides. ofthe slot.

Attached, to the screw head 43 is an adjusting rod 44, F,g$. 6,.a ncl,7,4 which is adapted to be manually grasped for the purpose of turningthe clamping screw 41 and its hcad 43` seas; either to tighten. the` clamp member 39 theV slot 38' Orl loosen it. When tightened` the` clamprnernber39,incooperation withthe clamping member. or. blt .,.ls:351;V Operate.- to, clamp therebetween the spacer member flange 23, see Figs. 6 and 7. Upon loosekningfthe clampingyserewthrough the medium of the adjustingQrQd, 441theclarnp member 39may be shifted downwardly' withinttiasuide` slot 38r so as to free it from abnttingrelation-to theflange-ZS. This operation results in releasinguthefoperative connection between adjustingslidel,andfthefspacer member 22, 23 thereby enabling; the entrefhoning; 1I.1 :1,1'f1r1i.srr1 to be withdrawn from the workpieceand shifted rearwardly relative to the adjusting slide in a direction away fromthe operaufteilen@ .Ohthe hsiriitis.1001.-A

'l`lrerslidey 39isadjustably supported on a pair'of upper and lower; longitudinal guide rods 45, therear ends of these rods beingranchoredlinthe. frame bracket member- 32, Figs.' land 5.1, These guide rods are formed with re-f dtledlfrontfends. projecting, through holes in a front bralsettlfseeursd to. the bracket `member 31- Clamping` nuts.4'1,l are. attah,ed to the threadedends ofthe guide rQds 45,.and'servethepurpose. of clamping them in fixedl positions `to 4the `front bracketA 46. lnterposed between the,

guiderodsAS 4|isa.sl ];aft48,f, this shaft extending` through: bracketlmernber 3,2and having a bearing therein, ,seey Figs. lrandvrvS.v A ,stop coll,ar\49; Figs. l and 6, is pinned tonthlelraxft 48-.andf,is.ad,apted to abut the stationary bracket32, The.,shagftf48lhas.a threaded extension 48a; extendinginto;` a; tappedhole intl the adjusting slide. 30'.-

F0r;lhf?:Pl.lFP9$ 50i turningthe shaft 48 in order to adjustthefsljdefoialong thegnide rods- 45 there is provided-,a hand knobl) Ahaving a shank 50a embracing the.` end portion of,sl 1a ft-48:and pinned-thereto. Securedto,

the,enelolthehankj60a,is` an annular, thimble or ring 5 1- Whichfis. dimensicnally marked. hand;knob- SOtojadjust the-slidel30lA toward or from the bracket onabutmentflfthe extent of this adjustment may bedetermined accurately bythe ,dimensional markings on.v

thimble 51. anda f ixedgarrow,` or, pointer.

Ingthepresent; embodiment` the adjusting rod` ort draw` bar 2,1 is .attachedwatfits forward end, to the rear end of arconetshaft. 5 2.F The opposite reduced end of the cone shaft fits within a hole in the abrading head 11 and, is .pinnedtheretuoxat,` 52m,` The cone shaft is mountedA within,frontn and, rear, .bearings `53 and. 54, these bearings being interposed.,betweenthe.cone shaft;l and the spindle 1Q.. Thefrontjbearing 53V is.v keyed. at 53a, see Fig. 4to

gana. Shaftf. The rearnbearins ,54 .is Lheld between By turning the:

a shoulder on spindle and a cylindrical bushing 55. This bushing or bearing spacer engages at opposite ends thereof the bearing members 53 and 54. Embracing the bearing 53 and also the forward end of the spindle 10 is an annular guide support 56. This support has a bearing on the bearing member 53 and is counterbored to receive and iit over the forward end of the spindle 10 to which it is pinned. The guide support 56, as shown in j Figs. l and 4, carries four annularly spaced carbide guide inserts 57, these inserts fitting into and being secured within slots in the guide support 56. The guide inserts project outwardly and radially from the supporting member 56 and are adapted to engage the inner surface -of the cylindrical bore portion 58 of the workpiece W. In the present instance this cylindrical bore 58 of the workpiece terminates in a tapered or cone shaped bore 58a. The front bearing 5,3 is held in position ony the cone shaft 52 by means of a retainer plate or disk 59 secured at 59a to the forward end of the guide support S6, see Fig. 4.

The guide support 56 is provided with four equally and annularly spaced radial slots 60 which mate with slots 61 in the retainer plate 59, see Figs. l and 4. `A series of four equally and annularly spaced push and pull links 62 have their rear ends disposed in the slots 60, 61. These links are pivoted at their rear ends to the guide support S6 through the medium of bearing screws 63 which enable the rear ends of the links A62, to have pivotal motion relative to the guide support 56. The cone shaped abrading or honing head 11 is provided with four equally spaced tapering guide slots 64 which communicate lat their rear ends thereof with rectilinear slots 65 extending into the abrading head 11 to receive the links 62, see Figs. l and 3. The links 62 extend freely through the slots 64, 65 and are pivoted at their forward ends by pins 70 to the rear ends 66a of stone holders 66. As-shown in Figs. 2 and 3, each stone holder 66 is disposed within a radial slot 64 in abrading head 11 and has a bearing at opposite sides thereof on a pair of side wear strips 67 attached by means of screws 67a to the abrading head 11. Each stone holder engages `and has a bearing on a bottom wear strip 68 also attached by screws 68a: `to the abrading head. Mounted and secured within slots in the stone holder 66 are four equally spaced radially extending abrading elements or honing stones 69. These stones, as illustrated in Fig. 2, project outwardlyfrom the abrading head 11 and terminate in arcuate working surfaces engageable with the inner surface of the tapered bore 58a of the workpiece. It will beA understood that the base of each tapering slot 64 is parallel tothe tapered bore 58a of the workpiece and in like manner the outer working surfaces of the abrading elements or honing stones. 69 are inclined or tapered so as to correspond to the taper of the bore 58a of the workpiece. Accordingly,

tact the tapered bore of the workpiece.

mitted to the stone holders 66 and thence to the abrading elements or honing stones 6 9 through the medium of the push and pull links 62 which havearticulate connections 63 and 70 at opposite ends thereby enabling the honing means to travel angularly in guide slots 64 with respect to the direction of travel of the spindle means so as to hone uniformly the tapered or cone shaped bore 58a of the workpiece.

The abrading or honing head 11 is adjustable longitudinally by means of the cone shaft 52 so as to'progressively displace or shift the honing head in a direction axially of the spindle thereby enabling the stone holders 66 and the abrading elements or honing stones 69 carried thereby to continue uniform honing of the tapered bore 58u and the removal of stock therefrom until the bore has been honed to a predetermined size. For illustrative purposes the workpiece in the present instance comprises the cylindrical guide section 58 and meA tapered section 58a which is to be honed. Thus, it will be seen that the l section 58 serves as a guide for the honing tool spindle which is guided rectilinearly by guide members 57 adapted to reciprocate in guidingengagement with thecylindrical section 58 of the workpiece. In the event-the workpiece is tapered as at 58a from end to end it will be understood that the workpiece and the cylindrical guide section 58 will be supported end to end and the guide section, which is separate from the workpiece, will serve the same purposes as in the embodiment herein illustrated.

I claim: f l I 1.` Honing apparatus for honing the tapered bore of a workpiece, comprising reciprocable and rotatable spindle means, guide means carried by saidv spindle meansyexteriorly of said bore for guiding the spindle means in a rectilinear path, said guide means being reciprocable and rotatable with the spindle means, honing means adapted to be disposed in the workpiece bore and rotatable with said spindle means, said honing means including a honing head held against reciprocable travel with said spindle means and provided with taper guide means conforming to the taper of the workpiece bore, and honing devices connected to said spindle means and shiftablethereby along said taper guide means for honing said bore.

l 2. Honing apparatus according to claim l including means for adjusting said honing head axially relative to said spindle means.

3. Honing apparatus for honing the tapered boreof a workpiece, comprising reciprocable and rotatable spindle means, guide` means carried by said spindle means exten'orly of said bore for guiding theI lspindle meansin axial Ialignment with the axis of the workpiece b ore, said guide means being reciprocable and rotatable with the spindle means, honing means adapted to be disposed in the workpiece bore and rotatable with said spindle means, said honing means including a honing head held against reciprocable travel with said spindle means and provided with taper guide means conforming to the taper of the workpiece bore, honing devices shiftablealong said taper guide means for honing said bore, and means for pivotally connecting said honing devices to said spindle.

means for reciprocable travel therewith relative to` the honing head. l. t

4. Honing apparatus according to claim 3 -including means for axially adjusting said honing head` relative to the workpiece. l v

5. Honing apparatus for honing the tapered bore of a workpiece, comprising reciprocable and rotatable spindle means, a honing head, shiftable rod means extendingl axially within said spindle means andl connectednat `one end to said honing head, connecting meansfor connecting the opposite end of said rod means to said-spindle. means to provide for relative shiftable movement thereof;

axially -of the spindle means togetherl with rotation of the honing head with-the spindle means, said A.honingheal having annularly spaced taperedk guide meansy conforming to the taper of the workpiece bore, annularly spacedv honing devices shiftable along said tapered guide'means. for honing said bore, and means forpivotally connecting. said honing devices to said spindle means for .reciproca.

tion and rotation therewith. v

6. Honing apparatus for honing the tapered. hereof a workpiece, comprising reciprocable and rotatable spindle means, a honing head, shiftable rod means Aextending axially=within said spindle means and connected at one end to said honing head, connecting means for connecting the opposite end of saidrod means to said spindley 7 connectedat opposite ends to said honing devices and spindle means for transmitting reciprocable and rotatable motion of the spindlefmeans to said honing devices.

7. Honing apparatus for honing the tapered bore of a` workpiece, comprising reciprocable and rotatabled spin'- dle means, a honing head, shiftable rod means extending axially within said spindle means and' connected at' one end to' said honing head, connecting means for connecting the opposite end of said rod means to said' spindle means to provide'for relative shiftable movement thereof axially of the spindle means together'with rotationV of the honing head with the spindle means, said honing head having annularly spaced tapered guide means conforming to the taper of the workpiece bore, annularlyspaced honing devices shiftable along-said tapered guide means for honing said'bore, means for pivotally connecting said honing devices to said spindle means for reciprocation and rotation therewith, and means for adjusting said connecting means thereby to adjust said rod means and honing head axially of the spindle means.

8. Honing apparatus for honing the tapered' bore of a workpiece, comprising reciprocable and rotatable spindle means, a honing head, shiftable rod means extending axially within said spindle means and connected at one end to said honing head, connecting meansfor connecting the opposite end of said rod means to said'spindle means to provide for rclative'shiftable movementthereof axially of the spindle means together withrotati'onof the honing head with the spindle means, said honing head having annularly spaced tapered guide means conforming to the taperof the workpiece bore, annularly spaced honing devices shiftable along said tapered guide means for-honing said bore, means for 'pivotally connecting said honing devices to said spindle means for reciprocation and rotation therewith, and manuallyl operable means supported laterally of the-spindle means against move-V ment therewith and having means engageable-witn said connecting-means for adjusting the same thereb'y toadjust said rod means and honnghead axially ofthe spindle' means.

9. Honing apparatus forhoning the-tapered bore` of a workpiece, comprising reciprocable and rotatablev spindle means, a honing head, shiftable rodmeans extending axially within said spindle means and connected at'onei end to said honing head, connecting means forA connecting the opposite end of said rod' means* tosaid spindle' means to provide for relative shiftable movementthereofaxially of the spindle means together with rotation ofthe honing head with the Ispindle-means, said honing head having annularly spaced tapered guide-means conform'-` ing to the taper of the workpiece bore, annularly spaced honing devices shiftable along said taperedl guide means for honing said bore, means for pivotally connecting-said honing devices to said spindle means=forA reciprocation: and rotation therewith, manually operable means'. supported llaterally of the spindle means against movement therewith and having means engageable` withlfsaid. con-l necting means for adjusting the same 'thereby to adjust said rod means and honing head axially of-the spindle` means, and means for disengaging said manuallyoperablel means and connecting means to permit axial movement of the spindle means, honing head' and rod means `rela-- tive to said manually operable means.v

l0. Honing apparatus for honing-the tapered borefof` a workpiece, comprising reciprocable and rotatablespindle-V means, honingV means adapted tof bedisposediu-the tapered workpiece bore and including aihoningfheaddis` posed adjacent to but beyond 'one end of said.A spindlemeans, means for connecting 4said honing'head to'v thev spindle means for rotation therewith and yalso-for hld'-v ing the honing head against reciprocable'stravelrwiththe.. spindle means, said honing head having taper guide:` means conforming to the taper of the workpiece 'boreandf 8 saidV honing means including a honing device, and means for pivotally connecting said honing device to said spindle means for travel along said guide means angularly with respect to the travelv of the spindle means.

-111 Honing apparatus for honing the tapered bore of aI workpiece, comprising reciprocable and rotatable spindle means, a honing head, shiftable means connecting said honing head and spindle means to provide for relative shiftable movement of the honing head and spindle means together with simultaneous rotation thereof, said honing head having annularly spaced tapered guide means conforming to the taper of the workpiece bore, annularly spaced honing devices shiftable along said tapered guide means for honing said bore, andmeans for pivotally connecting said honing devices to said spindle means for reciprocation and rotation therewith.

12'. Honing apparatus for honing the tapered bore of a workpiece, comprising reciprocable and rotatable spindlemeans, honing'means adapted to be disposed in the workpiece bore and rotatable with said spindle means; said honing means including a honing head held against reciprocable travel with'said spindle means and provided with annularly spaced taper guide means conforming to the'taper of the workpiece bore, annularly spacedhoning devices shiftable along saidl guide means for honing said bore, annularly spaced guide devices connected to the spindle means forrectilinear travel therewith, and link means pivotally connecting each honing device to a guide device for'reciprocable travel therewith.

13. Honing apparatus according to claim 12 including means for axially adjusting said honing head relative to said honing devices.

14. Honing apparatus for honing the tapered bore of a workpiece, comprising reciprocable and rotatable spindle means, honing means adapted to be disposed in the tapered workpiece bore and including a honing head, interengaging means for connecting said honing head to said spindle means for'rotation therewith, means for holding said honing head against reciprocable travel with said spindle means, said honing head having taper guide means conforming to the taper of the workpiece bore and said honing means including honing device means shiftable along said guide means for honing said bore, guide means connected to the spindle means for rectilinear travel therewith, and means for pivotally connecting said honing devicemeans to said last named guide means.

15. Honing apparatus for honing the tapered bore'of a workpiece, comprisingreciprocable1 and rotatable spindle means, a honing head, shiftable rod means extending axially-within said spindle means and connected at one end to said honing head, connecting means'for connecting theopposite` end of said rod means to said spindle means to provide for relative shiftable movement thereof axially of the spindle means together with rotation of tliehoning` head with the spindle means, said honing head having tapered guide means conforming to the taper of the workpiecel bore, honing device means shiftable along said taperedy guide means for honing said bore, link means pivotally connected at opposite ends to said honing device means and spindle means for transmitting reciprocable and rotatable motion of the spindle'means to said honing device means.

References Cited in the file of this patent UNITED STATES PATENTS 499,979 Field June20, 1893 2,105,762 Zimmerman Jan. 18; 1938 2,264,360 Carlin Dec. 2, 1941 FOREIGN PATENTS 444,724 Germany May 27, 1 f 7 665,303 Germany Sept. 22, 938 

